terradb

TerraDB

A centralized database and REST API for Terraform data.

What is it?

TerraDB is a centralized database and REST API dedicated to hosting and serving Terraform data. It can be used as a native HTTP backend to store Terraform remote states.

Eventually, Terraboard will be ported to use TerraDB as a backend, and we are also working on InSpec plugins to perform compliance and acceptance tests on Terraform resources.

Requirements

• A MongoDB (>= 3.4) database

Why MongoDB?

As Terraform states are json documents, we think that a document-oriented database makes sense. We'd also like to be able to use a Database-as-a-Service so that we don't have to manage it. Thus, MongoDB is one (if not the only) obvious choice. However, to avoid blocking this tool adoption because of the bad reputation MongoDB may have to some sysadmins, we added an abstraction layer that will easily allow to add new storage backends.

Install from code

$ go get github.com/camptocamp/terradb

Usage

Command line options

Usage:
  terradb [OPTIONS]

Application Options:
  -V, --version           Display version.

MongoDB options:
      --mongodb-url=      MongoDB URL [$MONGODB_URL]
      --mongodb-username= MongoDB Username [$MONGODB_USERNAME]
      --mongodb-password= MongoDB Password [$MONGODB_PASSWORD]

API server options:
      --api-address=      Address on to bind the API server (default: 127.0.0.1) [$API_ADDRESS]
      --api-port=         Port on to listen (default: 8080) [$API_PORT]
      --page-size=        Page size for list results (default: 100) [$API_PAGE_SIZE]

Help Options:
  -h, --help              Show this help message

As a docker container

$ docker run -e MONGODB_URL="mongodb://mongo" \
             -e MONGODB_USERNAME="user" \
             -e MONGODB_PASSWORD="pass" \
             -e API_ADDRESS="0.0.0.0" \
             -p 8080:8080 camptocamp/terradb

Using as a Terraform remote backend

You can use TerraDB as an HTTP remote backend for Terraform:

terraform {
  backend "http" {
    address = "http://<terradb>:<port>/v1/states/<name>"
    lock_address = "http://<terradb>:<port>/v1/states/<name>"
    unlock_address = "http://<terradb>:<port>/v1/states/<name>"
  }
}

Note: do not use the / character in the project name.

API Documentation

The current API root is /v1.

Below is a list of endpoints, usable with the GET verb.

Endpoints returning lists are paginated; the page number and total number of results appear in a metadata section of the results.

/states

Returns the latest serial of each state stored in the database, along with its lock information.

/states/{name}

Returns the latest serial of a single state by its name, along with its lock information.

/states/{name}/serials

Returns all serials of a single state by its name. Lock information is not provided.

/resources/${state}/${module}/${name}

/resources/${state}/${name}

Architecture schema

Planned plugins

Grafana datasource

With a Grafana datasource we'll be able, among other, to display the plan status in a nice dashboard.

Terraboard

We plan to use TerraDB as a backend for Terrboard.

Prometheus Service Discovery

We could use TerraDB as a source for a Service Discovery to populate Prometheus' targets.

InSpec

We'd like to use TerraDB to make InSpec assertions. For example, verify that all resources of one kind on a cloud account are managed by Terraform.